Britain, the Soviet Union and Japan evinced interest in the possibilities of attaching lifting surfaces to armoured vehicles to permit them to be towed as gliders, the Soviet essay in the "carrier wing" field being illustrated above. Evolved by Oleg Antonov as the kryl'ataya tanka, this contraption was tested in December 1942 but failed to fly.

Hungary was working on an aerodinamically-refined transport glider, the R-21, and five examples reached an advanced stage in construction when the exigencies of the times dictated the abandoning of further work in 1944.